.box{
  width: 100%;
  height: 100%;
}

.box-size{
  box-sizing: border-box;
}

.fl{
  float: left;
}
.fr{
  float: right
}
.clearB::after{
  content: "";
  display: block;
  clear: both;
}


.pa{
  position: absolute
}
.pr{
  position: relative;
}


.center{
  text-align: center;
}

.white-space{
  overflow: hidden;
  text-overflow:ellipsis;
  white-space: nowrap;
}

.hover:hover{
  opacity: .8;
  cursor: pointer;
}